Automatic stop for brush making machines



. J 1932 c. JOBST 1,839,319

AUTOMATIC STOP FOR BRUSH MAKII IG MACHINES Original Filed Feb. 19, 1925 2 Sheets-Sheet l v ywentpz C022 r'a cZ 027s t Jan. 5, 1932. c, JQBST 1,839,319

AUTOMATIC STOP FOR BRUSH MAKING MACHINES Original Fiied Feb. 19, 1925 2 Sheets-Sheet 2 W r rvw '76 l L l mar 88 attorney an improved control mechan sm adapted for anism that serve to'operate the control mech- Patented Jan. 5, 1932 UNITED STATES PATENT OFFICE:

oonnnn JOBST, or TOLEDO, OHIO, ASSIGNOR fro THE :roLnno AUTOMATIC BRUSH MAP CHINE COMPANY, or ronnno, OHIO, A CORPORATION OF onro AUTOMATIC s'ror ronnnnsn MAKIN iviaonrnns Original application filed February 19,

sion of .an application, entitled Universal brush machines, bearing Patent No. 1,680,- 521, issued August '14, 1928.

The object of the invention is to provide use generally to automatic brushmachines but designed particularly for electrically op-. erated machines of the type described'in the application above referred to.

' In the drawings: v

Figure 1 is a side elevation of a brush makapplied. v

Figure 2 is a section through the driving motor and motor brake.

Figure3lis an enlarged view of the Wire feeding mechanism.

Figure 4 is a detailed View of the upper wire feed tube. a

Figure 5 is a detailed view of a portion of the brush back holding mechanism. 7 V

Figure 6 is an electrical diagram illustrating the control mechanism.

As hereinbefore stated, the invention'relates to a control mechanismfor automatically stopping a brush making machine and as the details of the brush making machine are not essential to the understanding ofthis invention except such portions of the mechanism, the brush machine will be described in general terms. As shown in Figure 1 the machine comprises a main frame 10 on which is mounted a tuft forming and separating mechanism 11, preferably of'thje'type form ing the subject matter of my co-pending application, SerialNof 527,590, filed January 7 1922. This 'mechanism comprises essenatially a. bristle holding magazine 12 having a tapering forward end '13 from which the tufts are successively picked'and transferred to a nozzle 14 by a pair of cooperating reciprocating, tuft picking-members v15 'and 16 respectively. The nozzle 14 is'reciproc'ated ing machine to which my invention may be r dium of the pinion 27 and gear 28. The tuft 1925, Serial No. 10,291. Divided and this application filed January 3, 1928. Serial No. 244,269.

toward and from the brush back holderby I Ineansof a crank 17 and pitman connection 18. The nozzle also has associated herewith a staple forming and driving mechanism (not shown in detail), this mechanism being driven by a second pitman connection 19 from a crank 20. For feeding the wire 'to the staple forming mechanism a pair of feed,

rolls 21 are arranged to draw thewire from a reel 22 through a guide 23iand deliver the U same through a tube 24 ,to the reciprocating nozzle 14. Further detailed description-0f the nozzle mechanism may be found in the application, Serial No. 527,590 above re: ferred to. l 1 r r The cranks 17 and are rotated about a shaft 25 which in turn derives its motion from an electric motor 26 through the mepicking members 15 and 16 are reciprocated transversely to the nozzle 14 in timed re1a-.

tion thereto by a bell crank lever 29.

The machine: is provided with a work holder adapted to present a different portion- I of the brush back to the nozzle 14 after each reciprocation of the latter. The work holder may be of any suitable constructiondeperid-v ing upon the type of brush to be'manufactured but, as illustrated the workholder comprises a base 30 on which a bifurcatedihead 31 is swiveled to oscillate about a vertical and yieldingly urged toward the rear. The

member 32' has a cam surface 35 on the rear endthereof which cooperates with a pin 36 1 on the-post 37 to maintain theforward end of the member 32 at a fixed distance from the outward position of the nozzle 14. For imparting the oscillatory movements to r the work holder there are arranged two cams .38 I I and 39 having cam followers 4O and'4l 00 operating therewith. The follower 40 is con- .neoted'to a spiral rack member42 which in turn operates with a segmental rack member 43 carried by the tube 44 depending upon the head 31. The arrangementis such that vertical movement of the rack 42 imparts an oscillatory movement to the segment 43 thereby oscillating the head 31. The other cam follower 41 is connected to a rod 46 arranged concentrically to the tube 44 and connected at its upper end to the member 32, the arrangement being such that vertical movement of the follower 45 causes the member 82to rock about the pin 34. The movements are effected in substantially the same manner as described in detail in my co-pending application, Serial No. 527,591, filed J anuary 7, 1922. p

The cams 38 and 39 are rotated by a worm wheel 47 which in turn derives its power from the shaft 25 through suitable transmission mechanism. As shown this mechanism comprises a worm 48, shaft 49, bevel gears 50 and 51, horizontal shaft 52 and bevel gears 53 and 54, the latter being connected to the shaft 25.

The electric motor 26 preferably has associated therewith an automatic brake mechanism designed to operate whenever the mo tor is deenergized and to be released whenever the motor is operated. lVhile the brake mechanism may be of any suitable construction, it is preferably made in accordance with the construction described inmy Patent No. 1,639,088 issued August 16, 1927, and comprises essentially a cone member 55 attached to the motor shaft 56. 57 is a second cone member having a threaded engagement 58- with a stationary bearing 59 and provided with a lever 60 connected to the armature 61 of an electro-magnet 62. A spring 63 normally urges the cone member 57 into engagement with the cone 55, while the electro-magnet when energized urges thecone member in the opposite direction. The electro-magnet 62 is associated with the electric motor 26 in such a manner that it is energized whenever the' motor is energized- Any suitable system of electric circuit may be used for operating the electric motor but as shown in Figure 6, 73, 74 and 75 are the leadsof a three-wire electrical service controlled by a switch 76. 77 is an electro-magnetically operated switch having its actuating magnet 78 in a circuit 79 which eX tends from the lead 75 to the lead 74 and includes anormally open push button switch 80 and two electro-magnetically operated switches 81 and 82. The switch 81 is closed when its actuating magnet 83 is energized and will automatically open when deenergized, while the switch 82 automaticallycloses when its actuating magnet 84 is deenergized and will be open when energized. These magnets are operated by a low voltage electrical current, the magnet 83being in a normally closed circuit 85 and the magnet 84 in a normallyopen circuit 86., Thus in the normal position of parts the circuit 79 may be closed by operation of the push button switch 80, which will energize the magnet 78 and close the electro-magnetically operated switch 77, starting the motor 26. The closing of the switch 77 establishes, through one of its blades 77a, a circuit 87 which shunts out the switch 80 but includes a normally closed push button circuit breaking switch 88. The electro-magnet 62 for operating the brake is included in a circuit 95 between the leads 73 and 74when the switch 77 is closed.

With the circuits as thus far described, it will be apparent that manual operation of the push button 80 will start the electric motor 26, while the operation of the push button 88 will stop the motor and apply the brake. The operation of the motor will drive the tuft setting mechanism and cause the nozzle 14 to be reciprocated toward the Work holder. It will be understood that at each reciprocation of the nozzle a tuft will have been completely formed and ejected by the nozzle'into the brush back supported by the work holder. Between each reciprocation of the nozzle 14 thework holder will lee-adjusted by means of the cams 38 and 89 and associated mechanism to present another portion of the brush back for the next succeeding tuft of bristles.

In the commercial manufacture of brushes it is desirable to stop operation of the machines instantaneously in case something goes wrong, thereby avoiding the wasting of material. F or instance, if the wire for forming the staples should break or become tangled, the continued operation of the machine would form and deposit tufts, but without securing the same with staples. Again, if the workman is careless and fails to properly clamp the brush back in the work holder, proper registration would not be secured and the product would thus be spoiled. To avoid such waste I have provided various controls which instantaneously stop the machine when anything is ab normal;

'These controls are operated by the low voltage circuits 85 and 86, the former being normally closed and the latter being normallyopen. As has been described, the closed circuit 85 energizes. the'magnet 88 which holds theswitch 81 closed and upon the breaking of the circuit 85 the switch 81 will automatically open, thereby causing the opening of the switch 77 for the motor 26. On the other hand, the circuit 86 which is normally open, if'at any time closed, will energize the magnet 84 which will open the switch 82, this also. causing the opening of the switch 77 for the motor 26. The circuit 85 'includesa portion of the wire which is fed to the staple forming mechanism, and therefore, if the wire breaks the circuit 85 willbe automatically'opened, stopping the motor26. The circuits 85-and 86 are supplied with low voltage current from the transformer 97, one low voltage terminal being grounded on the frame of the machine as indicated at 98. The circuit 85, after including the magnet 83, leads to a contact finger 99 mounted on an insulated support and extending to normally bear against the staple wire 100, thus forming the other ground of the circuit. As long as-the wire is being fed the circuit remains. complete but if the wire breaks and moves out of contact with the finger 99 the circuit 85 will be opened, deenergizing the magnet 83 and permitting the opening of the switch 81. which, deenergizing the magnet 78, opens the switch 77 of the motor 26. The circuit 86 after including the magnet 84'extends to various parts of the machine where any abnormal condition will close a ground connection. One of these parts is a tube 101, which surrounds the staple feed wirelOO but is out of electrical contact therewith. Thus during the normal operation of the machine the circuit 86 will remain open but if the wire clogs and buckles within the tube 101, this will close the ground which by energizing the magnet 84 opens the switch 82, deenergizing the magnet 78 and opens the switch 77 of the motor 26...

Another part of the machine controlling the'circuit 86 is in connection with the Work holders. As shown in Figure-1, the forward end of the member 32 is provided with slide,- ways 67 for receiving exchangeable workholding heads 68 to which the brush backs:

WVhenevera brush back is 69 are secured. I completed the clamping head 68 is removed and another clamping head inserted lIl lts place. If the operator fails to press the new head into full engagement with the holders, thereby leaving the brush backs out of registration, this will automatically close the circuit 86 so that it will be impossible to start.

the motor 26. Thus as shown, the member 32 has an electric switch 102 mounted thereon in such a manner that it is normally open but is closed whenever the head is in full engagem'ent withthe holder. Thus if the head is not in its proper position, the circuit 86 will remain open, rendering the starting of the motor impossible.

It will be obvious that similar switches may be placed at various points in the machine, where any lack of operative condition will close the circuit 86 and render the motor closing circuits inoperative.

What I claiin as my invention is I 3 1. In a brush machine, the combination with tuft setting mechanism, a motor for operating thesame, a brake for'arresting movement of the driven mechanism when said motor 18 deenergized and means for-applying said brake, of an electric control circuit for automatically deenergizing said motor and operating said brake applying means under an abnormal condition in the machlne.

2.111 a brush machine, the combination with tuft-settingmechanism, a motor for operating the same and a brake for arresting movement of'the driven mechanism when said motor is deenergized,'of a plurality of electriccontrol circuits for deenergizing said motor and-applying said brake respectively uponthe closing or the opening ofsaid circuits,-and a. plurality of devices for respe'ctively opening and closing said control circu ts' upon -abnormal' conditions in the machine.

3;='In a brush machine,-the combination- With tuft setting mechanism, a motor for V operatingthe same and a'brake for arresting movement of the driven mechanism when said motor is deenergized, of 'azplurality of electric control circuits fordeenergizing said motor and applying said brake, a portion of r I said circuits being normally closed and a pormally open circuit being also provided with a contact for cooperating with said feed wire upon the bending or buckling of the same, whereby operation of said tuft setting mechanism is arrested upon either failure of wire or clogging of the stapleforming mechanism.

5.; In a brush machine, the combination with tuft setting mechanism, a motor for operating the same and a brake for arresting movement of the driven'mechanism when said motor isdeenergized, of a normally closed electric control circuit adapted tostop the machine when opened and means dependent upon the normal operation of a part of the machine for maintaining saidcontrol circuit closed.- V

6. In a brush machine, the combination 'with tuft setting mechanism, a motor for operating the same and a brake for arresting movement of the driven mechanismwhen said motor is deenergized, of a normally closed electric'control circuit adapted to stop the machine when opened and means dependent upon the normal operation of one part of the machine for maintaining saidcontrol circuit closed, a normally open circuit adapted to stop the machine when closed and means in said normally open circuit adapted tov close the same upon abnormal operation of another part of said machine.

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